Python Logging examples

index.py

import logging
logger = logging.getLogger('name of app')

logger.info('whatever')


logging.basicConfig(stream=sys.stderr)


import logging
logging.basicConfig(filename=‘scheduler.log’,level=logging.DEBUG)
logging.warning(‘Scheduler log started @ ’ + strftime(“%Y-%m-%d %H:%M:%S”, gmtime()))
def job1():
    logging.warning(‘Job started... ’ + strftime(“%Y-%m-%d %H:%M:%S”, gmtime()))
    
import argparse
import logging

def main(parsed_args):
    log_levels = (logging.WARN, logging.INFO, logging.DEBUG,)
    logging.basicConfig(level=log_levels[parsed_args.verbose])
    logging.info('Starting processing topic {0}'.format(parsed_args.topic))
	
if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('-v', '--verbose', action='count', default=0,
                        help='Output debug logging, more v\'s=more detail')
    parser.add_argument('-s', '--server', help='Hostname:port to connect to', default=None)
    parser.add_argument('topic', help='Topic to validate values on')
    args = parser.parse_args()
    main(args)
    
def create_logger(logger_name: str, log_path: str) -> logging.logger:
    """Create a logging object for STDOUT and FILE to avoid print statements.
    
    Args:
        logger_name (str): name for the logger used in getLogger()
        log_path (str): file path for log outputs, assumes it exists.
        
    Returns:
        logging.logger
    """
    log_formatter = logging.Formatter(("%(asctime)s [%(threadName)-12.12s]"
                                       "[%(levelname)-5.5s]  %(message)s"))
    logger = logging.getLogger(logger_name)

    file_handler = logging.FileHandler(log_path)
    file_handler.setFormatter(log_formatter)
    logger.addHandler(file_handler)

    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setFormatter(log_formatter)
    logger.addHandler(console_handler)

    # adjust as needed
    logger.setLevel(logging.DEBUG)
    return logger